Register the Hyper-V VSS Writer

When backing up Hyper-V environments with Windows Backup, it’s sometimes a little less known that a registry entry is required to get VSS consistent backups of Hyper-V guests. It’s important to register the Hyper-V VSS writer as otherwise the backup will say success, however the guest machines may not be in a state which means they can be restored or recovered properly.

V VSS Writer

A regular VSS snapshot won’t back up Hyper-V properly.

Below are the steps that are required to register the Hyper-V VSS writer correctly.

NOTE: Changing the registry can cause the operating system to become unstable. Often causing Blue Screen of Death or affect performance. If you’re unsure on any of this – either contact Microsoft or an IT professional for assistance.

  1. Click Start, click Run, type regedit, and then click OK.
  2. Locate the following registry key:

                   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion

  1. Right-click CurrentVersion, point to New, and then click Key.
  2. Type WindowsServerBackup, and then press ENTER.
  3. Right-click WindowsServerBackup, point to New, and then click Key.
  4. Type Application Support, and then press ENTER.
  5. Right-click Application Support, point to New, and then click Key.
  6. Type {66841CD4-6DED-4F4B-8F17-FD23F8DDC3DE}, and then press ENTER.
  7. Right-click {66841CD4-6DED-4F4B-8F17-FD23F8DDC3DE}, point to New, and then click String Value.
  8. Type Application Identifier, and then press ENTER.
  9. Right-click Application Identifier, and then click Modify.
  10. In the Value data box, type Hyper-V, and then click OK.

The end result when you register the Hyper-V VSS writer

If you’ve made it this far, then the Hyper-V VSS writer is registered and you’re ready to back up your Hyper-V guests properly.

Operating Systems that need to register the Hyper-V VSS writer

Server 2008, SBS 2008, Server 2008 R2, SBS 2011, Server 2012, Server 2012R2, Server 2016.

How Test My Backups can help

If you’re not in the backup and data protection industry, it’s likely that you’re spending time working on this when there are more important things to do. Let the Test My Backups team configure and manage your business backups and spend the time working at building your business – without the stress of what will happen if data loss happens.

We’re Hyper-V backup experts and can solve any issues you’re having with your Hyper-V environment.

By |2018-05-11T19:13:22+00:00April 18th, 2018|

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